eleventy.config.js

import { EleventyHtmlBasePlugin } from '@11ty/eleventy'
import pluginNavigation from '@11ty/eleventy-navigation'
import pluginSyntaxHighlight from '@11ty/eleventy-plugin-syntaxhighlight'
import pluginFavicon from 'eleventy-favicon'
import { DateTime } from 'luxon'
import { exec } from 'node:child_process'
import { createHash } from 'node:crypto'
import path from 'node:path'
import pluginImages from './eleventy.config.images.js'

const now = String(Date.now())

export default function eleventyConfig(eleventyConfig) {
  // Copy the contents of the `public` folder to the output folder
  // For example, `./public/img/` ends up in `_site/img/`
  eleventyConfig.addPassthroughCopy({
    './public/': '/'
  })

  // Can't ignore public/style.css, which is ignore by gitignore
  eleventyConfig.setUseGitIgnore(false)

  eleventyConfig.addShortcode('version', () => now)

  // Run Eleventy when these files change:
  // https://www.11ty.dev/docs/watch-serve/#add-your-own-watch-targets

  // Watch content images for the image pipeline.
  eleventyConfig.addWatchTarget('content/**/*.{svg,webp,png,jpeg}')

  eleventyConfig.addWatchTarget('styles/**/*.{css,js}')

  // App plugins
  eleventyConfig.addPlugin(pluginImages)

  // Official plugins
  eleventyConfig.addPlugin(pluginFavicon)
  eleventyConfig.addPlugin(pluginSyntaxHighlight, {
    preAttributes: { tabindex: 0 }
  })
  eleventyConfig.addPlugin(pluginNavigation)
  eleventyConfig.addPlugin(EleventyHtmlBasePlugin)

  eleventyConfig.addFilter('debug', (value, stringify) => {
    if (stringify) {
      console.log(JSON.stringify(value, null, 2))
    } else {
      console.log(value)
    }
    return ''
  })

  // Filters
  eleventyConfig.addFilter('isImage', (filename) => {
    return /\.(jpg|jpeg|png|webp|gif|tiff|avif|svg)$/i.test(filename)
  })

  eleventyConfig.addFilter('isPreviewable', (filename) => {
    return /\.(js|html?|diff|patch|css|txt|php)$/i.test(filename)
  })

  eleventyConfig.addFilter('extension', (filename) => {
    return path.extname(filename).replace(/^\./, '')
  })

  eleventyConfig.addFilter('bytesToKilos', (bytes) => {
    const kilos = bytes / 1024
    return `${kilos.toFixed(1)} KB`
  })

  eleventyConfig.addFilter('readableDate', (datetime, format, zone) => {
    // Formatting tokens for Luxon: https://moment.github.io/luxon/#/formatting?id=table-of-tokens
    const date = new Date(datetime)
    return DateTime.fromJSDate(date, { zone: zone || 'utc' }).toFormat(
      format || 'LLLL d, yyyy'
    )
  })

  // Get the first `n` elements of a collection.
  eleventyConfig.addFilter('head', (array, n) => {
    if (!Array.isArray(array) || array.length === 0) {
      return []
    }
    if (n < 0) {
      return array.slice(n)
    }

    return array.slice(0, n)
  })

  // Return the smallest number argument
  eleventyConfig.addFilter('min', (...numbers) => {
    return Math.min.apply(null, numbers)
  })

  // Return all the tags used in a collection
  eleventyConfig.addFilter('getAllTags', (collection) => {
    let tagSet = new Set()
    for (let item of collection) {
      ;(item.data.tags || []).forEach((tag) => tagSet.add(tag))
    }
    return Array.from(tagSet)
  })

  eleventyConfig.addFilter('filterTagList', function filterTagList(tags) {
    return (tags || []).filter(
      (tag) => ['all', 'nav', 'post', 'posts'].indexOf(tag) === -1
    )
  })

  eleventyConfig.addFilter('hash', function (str) {
    if (!str) return ''
    return createHash('sha256').update(str.trim().toLowerCase()).digest('hex')
  })

  // Shortcodes
  eleventyConfig.addShortcode('currentYear', () => {
    return DateTime.local().toFormat('yyyy')
  })

  eleventyConfig.on(
    'eleventy.after',
    async ({ results, runMode, outputMode }) => {
      if (
        results.length > 0 &&
        process.env.NODE_ENV === 'development' &&
        runMode === 'serve' &&
        outputMode === 'fs'
      ) {
        exec('npm run searchindex', (err, stdout) => {
          if (err) {
            console.error(err)
            return
          }
          console.log(stdout)
        })
      }
    }
  )

  // Features to make your build faster (when you need them)

  // If your passthrough copy gets heavy and cumbersome, add this line
  // to emulate the file copy on the dev server. Learn more:
  // https://www.11ty.dev/docs/copy/#emulate-passthrough-copy-during-serve

  // eleventyConfig.setServerPassthroughCopyBehavior("passthrough");

  return {
    // Control which files Eleventy will process
    // e.g.: *.md, *.njk, *.html, *.liquid
    templateFormats: ['md', 'njk', 'html', 'liquid'],

    // Pre-process *.md files with: (default: `liquid`)
    markdownTemplateEngine: 'njk',

    // Pre-process *.html files with: (default: `liquid`)
    htmlTemplateEngine: 'njk',

    // These are all optional:
    dir: {
      input: 'content', // default: "."
      includes: '../_includes', // default: "_includes"
      data: '../_data', // default: "_data"
      output: '_site'
    },

    // -----------------------------------------------------------------
    // Optional items:
    // -----------------------------------------------------------------

    // If your site deploys to a subdirectory, change `pathPrefix`.
    // Read more: https://www.11ty.dev/docs/config/#deploy-to-a-subdirectory-with-a-path-prefix

    // When paired with the HTML <base> plugin https://www.11ty.dev/docs/plugins/html-base/
    // it will transform any absolute URLs in your HTML to include this
    // folder name and does **not** affect where things go in the output folder.
    pathPrefix: '/'
  }
}